package com.hc.threadpool.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * @Author: huangcheng
 * @CreateTime: 2023-09-06  10:40
 * @Description:
 * @Version: 1.0
 */
@Configuration
public class SpringThreadPoolConfig {
    /** 核心线程数（默认线程数） */
    private static final int corePoolSize = 20;
    /** 最大线程数 */
    private static final int maxPoolSize = 100;
    /** 允许线程空闲时间（单位：默认为秒） */
    private static final int keepAliveTime = 10;
    /** 缓冲队列大小 */
    private static final int queueCapacity = 200;
    /** 线程池名前缀 */
    private static final String threadNamePrefix = "spring-Async-Service-";

   @Bean("springTaskExecutor") // bean的名称，默认为首字母小写的方法名
   public ThreadPoolTaskExecutor taskExecutor(){
       ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
       executor.setCorePoolSize(corePoolSize);
       executor.setMaxPoolSize(maxPoolSize);
       executor.setQueueCapacity(queueCapacity);
       executor.setKeepAliveSeconds(keepAliveTime);
       executor.setThreadNamePrefix(threadNamePrefix);
       // 线程池对拒绝任务的处理策略
       // CallerRunsPolicy：由调用线程（提交任务的线程）处理该任务
       executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
       // 初始化
       executor.initialize();
       return executor;
   }
}
